# Callisto

Callisto (Jupiter IV) is a moon of Jupiter, discovered by Galileo Galilei in 1610. It orbits Jupiter every 16.7 days and shines at about magnitude 5.6.

Ancient, dark and cratered; it strays farthest from Jupiter, up to about 10′ away.

Open AstroPilot to see where Callisto is next to Jupiter tonight and how easy it is with your telescope. https://astropilot.space/object/callisto